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United States Patent | 6,252,389 |
Baba ,   et al. | June 26, 2001 |
A current detector includes a Hall-effect device 18 for detecting a magnetic field generated by a current flowing across a conducting portion; a magnetic core 19 having a first end face for concentrating a magnetic flux and a second end face having a smaller area than the first end face, only the second end face being disposed at a position in close proximity to or in abutment against a magnetic field detecting surface of the Hall-effect device; and a signal processing circuit 26 for processing an output signal from the Hall-effect sensor 18 into a signal representing the current flowing across the conducting portion.
Inventors: | Baba; Sadaaki (Tokyo, JP); Inoue; Satoru (Tokyo, JP) |
Assignee: | Mitsubishi Denki Kabushiki Kaisha (Tokyo, JP) |
Appl. No.: | 156392 |
Filed: | September 18, 1998 |
Mar 18, 1998[JP] | 10-068341 |
Current U.S. Class: | 324/117H; 324/251; 327/511; 335/18; 361/187 |
Intern'l Class: | G01R 019/15; G01R 019/165; G01R 033/07; H01H 047/00 |
Field of Search: | 324/207.2,117 R,117 H,235,252 323/294,368 327/511 361/57,93.1,187 335/18 |
3185920 | May., 1965 | Brunner | 324/207. |
3199630 | Aug., 1965 | Engel et al. | 324/207. |
4283643 | Aug., 1981 | Levin | 324/117. |
4394619 | Jul., 1983 | Gschwandtner | 327/117. |
4639665 | Jan., 1987 | Gary | 324/117. |
4692703 | Sep., 1987 | Extrance et al. | 324/117. |
4749939 | Jun., 1988 | Seitz | 324/117. |
4893073 | Jan., 1990 | McDonald et al. | 324/117. |
5942895 | Aug., 1999 | Popovic et al. | 324/117. |
Foreign Patent Documents | |||
4-27653 | May., 1992 | JP | . |